More information on country A. The language test is compulsory for everyone apart from citizens of two nearby countries, who don't have to take it - also some Germans don't have to take it. The residence requirement is 9 years (but only 2 years for those from the 2 nearby countries mentioned before (all slightly unfair). You will also be required to shake hands with the mayor of the town where you are at the naturalization ceremony (attendance at this is also compulsory).
Also who the hell is Lionel ?
Could this be Finland?
They recognize dual nationality only with other EU countries and Brits had to get their applications in before Brexit was finally concluded - now they would have to give up British nationality but it was different then. Crucially they do not recognize dual nationality with Turkey ! 